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Satellite Link Layer Performance Using Two Copy SR-ARQ and Its Impact on TCP Traffic

By Jing Zhu and Sumit Roy


Abstract. The paper focuses on improving performance of land mobile satellite channels (LMSC) at higher frequencies such as K or EHF band, where shadowing is the primary impediment to reliable data transmission. Compared with short-term multipath fading, shadowing is characterized by longer time constants so that interleaving is not desirable as it introduces unacceptably large delays. To combat error bursts, an adaptive two-copy SR-ARQ scheme is proposed that uses a suitable delay between every retransmission. Closed-form solutions for metric of interest:mean transmission time, success probability, andresidual loss probabilityare derived and validated by simulation. An optimal choice of the delay is determined and the performance of TCP traffic over such a link layer is evalauted by simulation and compared to normal SR-ARQ in terms end-to-end throughput. 1 Introdu ction Currently, there is a great deal of interest in extending satellite communication

Year: 2014
OAI identifier: oai:CiteSeerX.psu:
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